A photoheterotroph gets its energy from
A) chemical reactions and its carbon from other organisms
B) the Sun and its carbon from other organisms
C) the Sun and its carbon from its environment
D) chemical reactions and its carbon from its environment
B
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A chunk of ice (T = -20°C) is added to a thermally insulated container of cold water (T = 0°C). What happens in the container?
A) The ice melts until thermal equilibrium is established. B) The water cools down until thermal equilibrium is established. C) Some of the water freezes and the chunk of ice gets larger. D) None of the above things happen.
According to the universal law of gravitation, if you double the masses of both attracting objects, then the gravitational force between them will
A) not change at all. B) increase by a factor of 2. C) decrease by a factor of 2. D) increase by a factor of 4. E) decrease by a factor of 4.
A proton moving along the x axis has an initial velocity of 4.0 × 106 m/s and a constant acceleration of 6.0 × 1012 m/s2. What is the velocity of the proton after it has traveled a distance of 80 cm?
A. 5.1 × 106 m/s B. 6.3 × 106 m/s C. 4.8 × 106 m/s D. 3.9 × 106 m/s E. 2.9 × 106 m/s
Compared to the Sun's convection zone, it is generally hotter in the
A) radiation zone. B) photosphere. C) core. D) All of the above.